Drop-hammer.



PATENTED JUNE 2, 1903.

G. F. FULLER. DROP HAMMER.

APPLICATION FILED DBO. 6, 1902.

N0 MODEL.

Pi CZsses No. 729,855. PATENTED JUNE 2, 1903.

fe. P. FULLER.

' DROP HAMMER.

urmonmn rum) mo. 6. 1902. no MODEL. a SHEETS-SHEET 2.

UNITE Smarts iPatented June 2, 1903.

GEORGE F. FULLER, OF WORCESTER;MASSACHUSETTS, ASSIGNOR TO WYMAN & GORDON, OF WORCESTER, MASSACHUSETTS, A CORPO- RATION OF MASSACHUSETTS.

DROP-HAM M ER.

SPECIFICATION forming part of Letters Patent No. 729,855, dated June 2, 1903.

Application filed December 6,1902. Serial No. 184,212. [No model.)

Myinvention relates to drop-hammers, and

more particularly an improvement in the mechanism which holds the hammer in its highest position.

The object of my invention is to improve upon the ordinary construction of the mechanism which holds the hammer in its highest position when it is raised through the action of the friction-rolls on the lifting-board in the ordinary way and after one of the friction'rolls has been moved out of engagement with the lifting boardpreparatory to the dropping of the hammer.

In my improvement I provide mechanism which will automatically clamp the liftingboard when the hammer is raised to its highest position and hold the hammer in its highest position Without any drop. vide mechanism which will automatically hold the clamping mechanism'for the liftingboard in its inoperative position when it is desired to have the hammer drop. The raising and dropping of the hammer are controlled 1 by the operation of a foot-treadle in the usual Fig. t is a detached detail, partly in section,

of the dog on the friction-bar. Fig. 5 is a detached detail of the looking or holding mechanism for holding the clamp mechanism of the lifting-board in its inoperative position looking in the direction of arrow b,Fig. 6. Fig.

I also pro- 6 is an edge view of some of the parts shown in Fig. 5 looking in the direction of arrow 0, same figure, and showing a detached portion, partly in section, of the frame; and Fig. 7 is, on an enlarged scale, a sectional detail of a part of the mechanism shown in Fig. 5. Figs. 3 to 7, inclusive, are shown on an enlarged scale.

In the accompanying drawings,1 is the base.

2 and 3 are the uprights or frame portions secured to the'base and'havin g ways or guides for the hammer 4:, carrying the die 5, and provided with the lifting-board 6, extending between the two con tinuously-rotating frictionrolls 7 and 8, fast on shafts 7' and 8', mounted in hearings on the head 9 of the frame 4. Each shaft 7 and 8 of the rolls 7 and S has fast thereon a belt-pulley 10. The two pulleys 10 are revolved in opposite directions to communicate a continuous rotary motion to each friction-r0117 and 8 in opposite directions to raise the hammer 4 by engagement of the rolls 7 and 8 with the lifting-board 6, all in the usual and well-known Way.

The shaft 7'of'the roll 7 is jonrnaled in a rocking arm to cause the roll 7 to be moved toward and away from the other roll 8 and into and out of engagement with the liftingboard 6 in the usual-way. The outward and inward movement of the 'friction-rol-l 7 is controlled in the ordinary Way through the movement of the trip-bar 11, pivotally attachedat its upper end and guided at its lower end inastand 11', attached to the upright 2.-

The lower end of the trip-bar 11 is in position to be engaged by a lever 12, pivotally mounted at 13 and attached through a flexible connector 14, preferably of wire rope, to the treadle 15, pivotally attached to the base 1 inthe usual way. To the lever 12 is connected a spring 12, which acts to rock the lever on its pivotal support and raise theouter.

.end of said lever and lower the inner end, as

shown-in Fig. 1.

On the trip-bar 11 is adjustably secured a dog 16 in such a position on the trip-bar that the same will be engaged by a projection 4' on the hammer 4 when said hammer reaches its highest upward movement.

The dog 16 is preferably provided with a spring-actuated plug or pin 17, which has a slight vertical motion within a chambered recess 16 in the dog 16. The reduced portion of the plug 17 is encircled by acoil-spring 13, which bears at one end against the enlarged end of the plug 17 and atits otherend against the end of the recess 16 in the dog 16. A nut 17 on the threaded end of the plug 17 holds the plug in place.

By means of the spring-actuated plug 17 in the dog 16 the jar on the trip-bar 11 andthe connecting mechanism by engagement of the hammer with the dog 16 is lessened.

I will now describe my improvements relating particularly to the clamp mechanism for the lifting-board to hold the hammer in its highest raised position after one of the friction-rolls has been moved out of engagement with the lifting-board and to the mechanism for holding the clamp mechanism in its inoperative position to allow of the dropping of the lifting-board and hammer. On a shaft 19, journaled in hearings on a frame 19, resting on the head 9, is fast a clamp-arm 20, (see Fig. 3,) which has a curved face eccentric with the end of the clamp-arm which bears against the lifting-board 6 on one side thereof and presses the lifting-board against a transverse bar 19 on the frame19 to clamp the lifting-board between the clamp 20 and the bar 19, which has its upper and lower edges preferably curved, as shown by broken lines in Fig. 3. Also fast on the shaft 19 is an arm 21, the outer end of which is loosely connected to the upper end of a verticallymoving bar 22, which has bearings in guides 23 and 24, secured to the upright 3,in thisinstance by bolts 23 and 24, having their heads extending in a T-shaped groove or way 25 in the frame 3. (See Fig. 1.) The lower end of the vertically-moving bar 22 has mounted thereon a spiral spring 26, bearing at one end against a collar 22, fast on the lower end of said bar, and at its other end against the lower guide 24. The spring 26 acts to start quickly the downward movement of the bar 22. The lower end of the bar 22 extends over and is adapted to be engaged by one end of a lever 27, pivoted at 28. The other end of the lever 27 is connected by a flexible connection 29,

preferably wire rope, to the treadle 1.5, as shown in Figs. 1 and 2. A spring30, con nected with the lever 27, acts to hold the inner end of the lever in its lowered position and the outer end of the lever in its raised position, as shown in Fig. 1. The weight of the bar 22 acts through arm 21 to rock the shaft 19 and move the clamp 20 into engagement with the lifting-board to clamp the board and hold the hammer in itshighest position. (See Fig. 2.)

I will now describe the mechanism which operates to hold the clamp 20 in its inoperative position to allow the lifting-board 6 and the hammer 4 to drop. This mechanism operates on the vertically-movin g bar 22 to hold.

said bar in its raised position. In the vertically-extending undercut T-shaped groove or way 25 in the upright 3 is loosely fitted a plate 31, which has on one end side projections 31, (see Fig. 5,) which are inserted into the undercut way 25 through one of the enlarged ends 25 thereof. (See Fig. 1.) The plate 31 is adjustable up or down in the way 25 and has extending out therefrom, and in this instance integral therewith, a bolt or pin 32, on which is loosely mounted a sleeve 33, having on its inner end an annular flange 33, which bears against the outer part of the frame 3 along the edges of the way 25. A nut 34, screwed onto the end of the bolt 32 through a washer 35, loose on the bolt 32, forces the end 33 of the sleeve 33 against the frame 3 and holds the plate 31 in its adjusted position in the way 25, the projections 31 on the plate 31 being .drawn into close engagement with the undercut edges of the way 25. On the sleeve 33 is loosely mounted a sleeve 36, the length of which is a little less than the distance between the washer 35 and the flange 33' on the sleeve 33, so that said sleeve 36 is free to turn or rock on the sleeve 33 without regard to the tightening of the nut 34. The sleeve 36 is flattened on its upper and lower surface, as shown in Fig. 5. The clamp device for the bar 22 comprises in this instance a block 37, forked at one end to extend tightly over the upper and lower flattened portions of the sleeve 36 to be supported on and have a slight rocking motion with said sleeve. The other end of the block 37 has an opening 37 therein, through which loosely extends the bar 22. Fitted into the opening 37, upon opposite sides thereof, are removable clamping surfaces or jaws 38, made of hardened steel and having a pin 38 thereon, which extends into a hole in the block 37 to hold the surfaces 38 in position, as shown in Fig. 7. The jaws 37 are beveled, one on its upper inner surface and the other on its lower inner surface, as shown in Fig.7. Extending up from the block 37 and forming a part thereof and in this instance integral therewith is the operating-arm 39, which is offset and has the rounded bearing-surface 39 at its upper end to engage the edge of thehammer4,as shown in Fig. 1. The hammer 4 preferably has its edge cut away, as shown at 4", and a beveled or inclined portion 4 at its upper end to receive the engaging end 39 of the clamp-arm 39. A spiral spring 40 encircles a pin 41, which at one end extends loosely through a hole in an car 31' on the plate 31 and at its other end is rounded to fit loosely into a cup-shaped recess in the end 39' of the arm 39. The spring 40 bears at one end against the ear 31" and at its other end against the rounded end of the pin 41 and acts to move over or toward the hammer the clamp-arm 39 and moves with it the block 37 to cause the jaws 38 to grip and hold the bar 22, when the clamp-arm 39 passes off of the beveled portion 4 of the hammer 4 and is released from engagement with the hammer as the ham mer drops and after the bar 22 has been raised through the downward movement of the treadle and the operation of the lever 27. The raising of the bar 22 releases the clamp from the lifting-board 6 and leaves the lifting board and the hammer free to drop, and, as above stated, the dropping of the hammer releases the clamp-arm 39 and allows the spring 40 to act to move over said arm and cause the jaws 38 to grip the bar 22 and hold it in its raised position when the treadle 15 is released and the lever 27 disengaged from the lower end of the bar 22.

free to drop, but held in their highest posi;

tion by my lifting-board clamp mechanism.

The engagement of the clamp-arm 39 with the grooved edge 4: of the hammer 4 holds the clamp-arm in its outward position, with the block 37 at its clamping end in a horizontal position, as shown in Fig. 1, to leave the opening therein free for the bar 22 to move in. The weight of the bar 22 through the arm 21 rocks the shaft 19 and moves the clamp 20 into engagement with the lifting-board 6 independent of any downward movement of the lifting-board to clamp the lifting-board between the transverse bar 19" and the clamp 20 and hold the lifting-board 6 and the hammer a in their highest raised position, as shown in Figs. 1 and 2. The hammer 4 and lifting-board 6 will remain in their highest raised position, as shown in Figs. 1 and 2, until released by the operation of the treadle. When it is desired to have the hammer drop, the operator presses down the treadle 15, which is held in its raised position by the spring 15 (shown in Fig. 2) in the ordinary way. The depression of the treadle 15 through the connector 14: moves the lever 12 against the action of the spring 12 and causes the lever 12 to engage the trip-bar 11 and hold the barin its raised position, and through intermediate connections the friction-roll 7 is disengaged from the lifting-board 6 as long as the treadle 15 is depressed. The depres' sion of the treadle 15 through the connector 29 to the lever 27 moves the lever 27 against the action of the spring 30 and causes it to engage the lower end of the bar 22 and move upwardly said bar against the action of the spring 26 thereon. The upward movement of the bar 22, which is free to move between the clamp surfaces or jaws 38 in the opening in the block 37, through arm 21 rocks the shaft 19 and disengages the clamp 20 from the lifting-board 6and leaves the liftingboard 6 and hammer 4 free to drop. As the hammer 1 and lifting-board 6 drop the bearing-surface 39 on the clamp-arm 39 passes onto the beveled portion-4 on the hammer 4 and is disengaged from the hammer, and

the spring 40 acts to move over the clamparm 39, and with it the block 37, rocking slightly the sleeve 36, on which said block is supported, and moving said block 37 into such a position that the clamped jaws 38 will grip and hold the bar 22 in its highest position when raised by the lever 27 through the depression of the treadle 15, as shown in Fig. 6. The releasing of the treadle 15 will disengage the lever 27 from the bar 22; but said bar will be held in its highest raised position by means of the clamp-jaws 38, and the clamp 20 will be held out of engagement with the lifting-board 6. The releasing of the bar 11 from the lever 12 after the hammer has dropped will allow the bar 11 to drop with the dog 16 andthrough intermediate connections move the friction-roll 7 into engagement with the lifting-board 6 in the usual way to raise the lifting-board and the hammer to their highest position. The raising of the hammer through the engagement of the projection l thereon with the dog 16 will release the friction-roll 7 from the liftingboard, as above described. At the same time the raising of the hammer will cause the bev eled portion 1 thereon to engage the bearing-surface 39 on the clamp-arm 39, and as the bearing-surface passes onto the straight grooved edge 4" of the hammer 4 the clamparm 39 will be moved outwardly against the action of the spring 10 and raise the biock 37 'from thepositionshown in Fig. 5 to the position shown in Fig. 1, bringing the clamping-jaws 38 in a position to leave a free pas- .board and the hammer in their highest position. Wlrenit is desired to have the hammer drop, the treadle 15 is again depressed and the operation above described again re peated.

The advantages of my improvements will be readily appreciated by those skilled in the art. i

It will be seen that as the hammer and lifting-board are raised to their highest position the friction-roll 7 on the lifting-board 6 is disengaged therefrom, and at the same time the clamp 20 is caused to engage the lifting-board 6 to hold it in its highest position, and there is no drop of the lifting-board or hammer until the clamp on the lifting-board is released by the depression of the treadle.

The raising of the lifting-boardand hammer to their highest position automatically operates the clamp mechanism of the bar 22 to allow the clamp 20 to clamp the lifting-' board and to hold it clamped until the treadle is depressed to cause the hammer to drop.

It will be understood that the details of construction of my improvements may be varied somewhat, if desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with the hammer, the lifting-board, rolls for engaging and raising the lifting-board, treadle mechanism, and connections intermediate one of said rolls and said treadle mechanism, of a clamp mechanism for clamping the lifting-board and holding the hammer in its raised position, and mechanism connected with said clamp mechanism, and arranged and adapted to be automatically operated by engagement with the hammer on the raising of the hammer to its highest position, to permit the clamp mechanism to operate and clamp the lifting-board, and to be automatically operated by disengagement with the hammer on the dropping of the hammer, to hold the clamp mechanism in its inoperative position, substantially as shown and described.

2. The combination with the hammer, the lifting-board, rolls for engaging and raising the lifting-board, treadle mechanism, and connections intermediate one of said rolls and said treadle mechanism, of a clamp mechanism for clamping the lifting-board and holding the hammer in its raised position, comprising a clamp adapted to engage said board, and connections therefrom to a verticallymoving bar, and said bar, adapted to be engaged at its lower end by a lever connected with a foot-treadle, and said lever and foottreadle, and mechanism connected with said bar, and arranged and adapted to be automatically operated by engagement with the hammer on the raising of the hammer to its highest position, to allow of the vertical movement of said bar and the operation of the clamp to clamp the lifting-board, and to be automatically operated by disengagement with the hammer on the dropping of the hammer, to hold said vertically-moving bar, and prevent the clamp from clamping the liftingboard, substantially as shown and described. 3. In a drop-hammer, the combination with the lifting-board, and a clamp-surface adapted to engage said board, and mounted on a rocking shaft, and said shaft, a connection therefrom to a vertically-movingbar, and said bar, moving in guides and adapted to be engaged at its lower end by a lever connected with a foot-treadle, and said lever, of a clamp mechanism for said bar to hold it in its raised position, said clamp mechanism comprising a block having an opening in one end for the vertically-moving bar, with clamp-surfaces in said opening, and forked shaped at its other end, to engage and be supported on and rock with a loosely-mounted sleeve, and said sleeve supported on an adjustable stud, and said stud, and means for adjusting it up or down in a vertical plane, and an arm extending out from said clamp-block and rigid therewith, and a spring to move said arm, which is engaged by the hammer as it is raised to its highest position, to move the clamp-block and release the vertically-moving bar, substantially as shown and described.

- -GEORGE F. FULLER. Witnesses:

J. C. DEWEY, M. HAAS. 

